scholarly journals Integrated System Technology of POME Treatment for Biohydrogen and Biomethane Production in Malaysia

2020 ◽  
Vol 10 (3) ◽  
pp. 951 ◽  
Author(s):  
Bidattul Syirat Zainal ◽  
Mohd Azwan Ahmad ◽  
Mahmoud Danaee ◽  
Nashrah Jamadon ◽  
Nuruol Syuhadaa Mohd ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Oil Palm ◽  
Relevant Literature ◽  
Organic Wastes ◽  
Integrated System ◽  
Two Stage ◽  
The United Kingdom ◽  
Stage Process ◽  
Biomethane Production ◽  
Integrated Bioreactor

In recent years, production of biohydrogen and biomethane (or a mixture of these; biohythane) from organic wastes using two-stage bioreactor have been implemented by developing countries such as Germany, USA and the United Kingdom using the anaerobic digestion (AD) process. In Thailand, biohythane production in a two-stage process has been widely studied. However, in Malaysia, treating organic and agricultural wastes using an integrated system of dark fermentation (DF) coupled with anaerobic digestion (AD) is scarce. For instance, in most oil palm mills, palm oil mill effluent (POME) is treated using a conventional open-ponding system or closed-digester tank for biogas capture. This paper reviewed relevant literature studies on treating POME and other organic wastes using integrated bioreactor implementing DF and/or AD process for biohydrogen and/or biomethane production. Although the number of papers that have been published in this area is increasing, a further review is needed to reveal current technology used and its benefits, especially in Malaysia, since Malaysia is the second-largest oil palm producer in the world.

scholarly journals Thermophilic anaerobic digestion of model organic wastes: Evaluation of biomethane production and multiple kinetic models analysis

2019 ◽  
Vol 280 ◽  
pp. 269-276 ◽  
Author(s):  
Dinh Duc Nguyen ◽  
Byong-Hun Jeon ◽  
Jae Hoon Jeung ◽  
Eldon R. Rene ◽  
J. Rajesh Banu ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Kinetic Models ◽  
Organic Wastes ◽  
Thermophilic Anaerobic Digestion ◽  
Biomethane Production

scholarly journals Improvement of Digestate Stability Using Dark Fermentation and Anaerobic Digestion Processes

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3552 ◽  
Author(s):  
Elena Albini ◽  
Isabella Pecorini ◽  
Giovanni Ferrara
Keyword(s):  
Anaerobic Digestion ◽  
Pilot Scale ◽  
Dark Fermentation ◽  
Second Phase ◽  
Reference Scenario ◽  
Biological Stability ◽  
Two Stage ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Stage Process

This paper assessed the effect of dark fermentation, the fermentative phase in a two-stage anaerobic digestion system, in terms of digestate biostabilization efficiency. The digestates analyzed in this study were obtained from a pilot-scale system in which two different substrates were used in order to simulate both the digestion and co-digestion process. Biostabilization performances were evaluated by measuring the specific oxygen uptake rate (SOUR) of the outgoing digestates. This index allowed us to define the degree of effectiveness in terms of stabilization of organic matter, between the traditional anaerobic digestion process and the two-stage configuration. Considering the traditional process as a reference scenario, the results highlighted an increase in biological stability for the two-stage co-digestion process, consisting of a dark fermentation stage, followed by an anaerobic digestion one. Digestates biostabilization efficiency increased up from 6.5% to 40.6% from the traditional one-stage configuration to the two-stage one by improving the anaerobic digestion process through a preliminary fermentative stage. The advantages of the two-stage process were due to the role of dark fermentation as a biological pre-treatment. Considering the partial stability results related to the second stage, biological stability was improved in comparison to a single-stage process, reaching an efficiency of 42.2% and 55.8% for the digestion and co-digestion scenario respectively. The dark fermentation phase allowed for a higher hydrolysis of the substrate, making it more easily degradable in the second phase. Results demonstrated better biostabilization performances of the outgoing digestates with the introduction of dark fermentation, resulting in more stable digestates for both the digestion and co-digestion process.

Two-stage anaerobic digestion process for complete inactivation of enteric bacterial pathogens in human night soil

2004 ◽  
Vol 50 (6) ◽  
pp. 103-108 ◽  
Author(s):  
D.P. Kunte ◽  
T.Y. Yeole ◽  
D.R. Ranade
Keyword(s):  
Anaerobic Digestion ◽  
Bacterial Pathogens ◽  
Single Stage ◽  
Shigella Dysenteriae ◽  
Pathogen Inactivation ◽  
Two Stage ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Complete Inactivation ◽  
Stage Process

Anaerobic digestion offers a good alternative for human waste treatment. However, the fate of enteric bacterial pathogens present in human night soil (HNS) remains a major concern for hygienic safety of the process. A two-stage anaerobic digestion process, consisting of separate acidogenic and methanogenic digesters, was designed and its efficacy in the inactivation of Salmonella typhi was compared to a single-stage digestion process. In a single-stage digestion, complete pathogen inactivation was achieved only in the digesters with high levels of volatile fatty acids (VFA ≅18,000 mg/l) and acidic pH (≅6.0). These digesters, however, showed drastic reduction in methane yield. In the two-stage digestion process, S. typhi was completely inactivated in the acidogenic digester and the methanogenic digester was free from the pathogen even after receiving a daily dose of the pathogen. The process also achieved complete inactivation of other enteric pathogens, viz., Shigella dysenteriae and Vibrio cholerae. The two-stage process was efficient in biogas generation from HNS. Thus, the two-stage process ensures complete hygienic safety in anaerobic digestion of human night soil.

scholarly journals Characterization and anaerobic digestion of highly concentrated Mexican wine by-products and effluents

2020 ◽  
Vol 81 (1) ◽  
pp. 190-198 ◽  
Author(s):  
M. Vital-Jacome ◽  
M. Cazares-Granillo ◽  
J. Carrillo-Reyes ◽  
G. Buitron
Keyword(s):  
Anaerobic Digestion ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Single Stage ◽  
Organic Load ◽  
Organic Loading Rate ◽  
Two Stage ◽  
Wine Production ◽  
Stage Process ◽  
By Products

Abstract Wine production has increased in recent years, especially in developing countries such as Mexico. This increase is followed by an increase of winery effluents that must be treated to avoid environmental risks. However, little information is available about the characteristics of these effluents and the possible treatments. This paper aimed to characterize the effluents and by-products generated by the Mexican winery industry and to evaluate the performance and stability of the anaerobic treatment using a single-stage and a two-stage process. Results showed that the winery effluents had a high content of biodegradable organic matter, with chemical oxygen demand (COD) values ranging from 221 to 436 g COD/L. The single-stage anaerobic process was able to treat an organic loading rate of 9.6 kg COD/(m3 d); however, it was unstable and highly dependent on the addition of bicarbonate alkalinity (0.31 g NaHCO3/g COD removed). The two-stage process was more stable working at a higher organic load (12.1 kg COD/(m3 d)) and was less dependent on the addition of bicarbonate (0.17 g NaHCO3/g COD removed). The results highlight the potential of the winery effluents to produce methane through anaerobic digestion in a two-stage process, making wine production more sustainable.

scholarly journals Assessment of Single- vs. Two-Stage Process for the Anaerobic Digestion of Liquid Cow Manure and Cheese Whey

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5423
Author(s):  
Margarita Andreas Dareioti ◽  
Aikaterini Ioannis Vavouraki ◽  
Konstantina Tsigkou ◽  
Michael Kornaros
Keyword(s):  
Anaerobic Digestion ◽  
Production Rate ◽  
Methane Production ◽  
Cheese Whey ◽  
Biogas Production ◽  
Single Stage ◽  
Cow Manure ◽  
Two Stage ◽  
Methane Production Rate ◽  
Stage Process

The growing interest in processes that involve biomass conversion to renewable energy, such as anaerobic digestion, has stimulated research in this field in order to assess the optimum conditions for biogas production from abundant feedstocks, like agro-industrial wastes. Anaerobic digestion is an attractive process for the decomposition of organic wastes via a complex microbial consortium and subsequent conversion of metabolic intermediates to hydrogen and methane. The present study focused on the exploitation of liquid cow manure (LCM) and cheese whey (CW) as noneasily and easily biodegradable sources, respectively, using continuous stirred-tank reactors for biogas production, and a comparison was presented between single- and two-stage anaerobic digestion systems. No significant differences were found concerning LCM treatment, in a two-stage system compared to a single one, concluding that LCM can be treated by implementing a single-stage process, as a recalcitrant substrate, with the greatest methane production rate of 0.67 L CH4/(LR·d) at an HRT of 16 d. On the other hand, using the easily biodegradable CW as a monosubstrate, the two-stage process was considered a better treatment system compared to a single one. During the single-stage process, operational problems were observed due to the limited buffering capacity of CW. However, the two-stage anaerobic digestion of CW produced a stable methane production rate of 0.68 L CH4/(LR·d) or 13.7 L CH4/Lfeed, while the total COD was removed by 76%.

Application of acidic thermal treatment for one- and two-stage anaerobic digestion of sewage sludge

2010 ◽  
Vol 62 (11) ◽  
pp. 2647-2654 ◽  
Author(s):  
M. Takashima ◽  
Y. Tanaka
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Phosphorus Recovery ◽  
Attractive Alternative ◽  
Two Stage ◽  
Digested Sludge ◽  
One Stage ◽  
Stage Process ◽  
The One

The effectiveness of acidic thermal treatment (ATT) was examined in a 106-day continuous experiment, when applied to one- or two-stage anaerobic digestion of sewage sludge (4.3% TS). The ATT was performed at 170°C and pH 5 for 1 hour (sulfuric acid for lowering pH). The one-stage process was mesophilic at 20 days hydraulic retention time (HRT), and incorporated the ATT as pre-treatment. The two-stage process consisted of a thermophilic digester at 5 days HRT and a mesophilic digester at 15 days HRT, and incorporated the ATT as interstage-treatment. On average, VSS reduction was 48.7% for the one-stage control, 65.8% for the one-stage ATT, 52.7% for the two-stage control and 67.6% for the two-stage ATT. Therefore, VSS reduction was increased by 15–17%, when the ATT was combined in both one- and two-stage processes. In addition, the dewaterability of digested sludge was remarkably improved, and phosphate release was enhanced. On the other hand, total methane production did not differ significantly, and color generation was noted in the digested sludge solutions with the ATT. In conclusion, the anaerobic digestion with ATT can be an attractive alternative for sludge reduction, handling, and phosphorus recovery.

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